16 September 1843 (Saturday Afternoon). 
Joseph Smith Diary, by Willard Richards
20 minutes after 3.—attend the review and inspection of the Legion with my staff. Gen Derby  acting inspecter. after which I took my part and gave orders.—after which made a speech to the legion highly satisfied with officers and Soldiers and I felt extremely well myself.
—16 September 1843
 See History of the Church, 6:34. Not in Teachings. The original source for the entry in History of the Church is the Joseph Smith Diary, by Willard Richards.
 Erastus H. Derby, born 14 September 1801, was a native of Hawley Township, Franklin County, Massachusetts. He is best remembered for his friendship and aid to the Prophet during the latter's attempts to avoid illegal arrest in 1842.